190-01007-C1
GTN Xi Part 23 AML STC Maintenance Manual
Rev. 1
Page 5-15
5.3.1.4 Remote Transponder Related Alerts
Table 5-6 Remote Transponder Alert Troubleshooting Guide
Alert Text
Possible Cause
Corrective Action
TRANSPONDER 1 OR 2 -
ADS-B Out system fault.
Pressure altitude source
inoperative or connection
lost.
The transponder has lost
communication with the
pressure altitude source.
Verify wiring between the transponder
and the pressure altitude source.
If problem persists, contact Garmin
technical support for service.
TRANSPONDER 1 OR 2 -
Transponder has failed.
The transponder has detected
an internal fault and
transponder functionality may
be unavailable.
Return unit to Garmin technical support
for service.
TRANSPONDER 1 OR 2 -
Transponder is in ground
test mode.
The transponder is operating
in a mode intended for ground
testing.
Cycle the power to the transponder.
TRANSPONDER 1 OR 2 -
Transponder overtemp.
The transponder is reporting
that its internal temperature is
above upper operating limits.
Check for adequate ventilation around
the transponder.
TRANSPONDER 1 OR 2 -
Transponder undertemp.
The transponder is reporting
that its internal temperature is
below lower operating limits.
Contact Garmin technical support for
service if this message persists.
TRANSPONDER 1 -
Transponder 1 needs
service.
The transponder is reporting a
system failure.
Refer to the transponder installation
manual.
TRANSPONDER 2 -
Transponder 2 needs
service.
The transponder is reporting a
system failure.
Refer to the transponder installation
manual.
TRANSPONDER 1 -
Transponder 1 is
inoperative or connection
to GTN is lost.
The GTN Xi cannot
communicate with the
transponder or the
transponder is reporting a
system failure.
If two transponders are present, ensure
that both GTN Xi units are powered on.
Check for proper configuration of the
GTN Xi and transponder RS-232 ports.
Check for correct wiring.
Refer to the transponder installation
manual.
TRANSPONDER 2 -
Transponder 2 is
inoperative or connection
to GTN is lost.
The GTN Xi cannot
communicate with the
transponder or the
transponder is reporting a
system failure.
Ensure that both GTN Xi units are
powered on.
Check for proper configuration of the
GTN Xi and transponder RS-232 ports.
Check for correct wiring.
Refer to the transponder installation
manual.
TRANSPONDER -
Transponder 1 and 2 Mode
S addresses do not match.
The transponders are
configured for different
Mode S addresses.
Check the Mode S address for each
transponder and verify that they match.
